UPS INSTALLATION PLAN AND UNPACKING
EATON
Eaton 9395 550/275 UPS (225–550 kVA) Installation and Operation Manual
S
164201716 Rev 2
www.eaton.com/powerquality
3-18
There is no manual DC disconnect device within the UPS.
A battery disconnect switch is recommended, and may be required by NEC or local
codes when batteries are remotely located. The battery disconnect switch should be
installed between the battery and the UPS.
External DC input overcurrent protection and disconnect switch for the remote battery
location is to be provided by the customer. Table 3‐17 or Table 3‐18 lists the
maximum rating for continuous‐duty rated circuit breakers satisfying the criteria for
both. Recommended breaker size is based on a maximum full load discharge time
less than 3 hours. For longer discharge times a larger breaker may be required
Table 3‐17. Recommended DC Input Circuit Breaker Ratings
UPS Model
Input Rating
400V
480V
Eaton 9395-550/275
1600A
1600A
NOTE
Because of the future upgradability to a fully rated 550 kVA UPS with the addition of the FI-UPM,
these breaker sizes are specified for 550 kVA.
Table 3‐18. Recommended DC Input Battery Disconnect Ratings – Separate Battery
UPS Model
Input Rating
(each UPM)
400V
480V
Eaton 9395-550/275
700A
700A
NOTE
Because of the future upgradability to a fully rated 550 kVA UPS with the addition of the FI-UPM,
these breaker sizes are specified for an 550 kVA.
Battery voltage is computed at 2 volts per cell as defined by Article 480 of the NEC.
Rated battery current is computed at 2 volts per cell.
The battery wiring used between the battery and the UPS should not allow a voltage
drop of more than 1% of nominal DC voltage at rated battery current.